I am thinking hard to find a suitable solution, but did not figure out yet.
thanks in advance for your input.
my diagram like
188.8.131.52/24-----R1-----184.108.40.206/24 T1 link-----R2-----application servers
traffic from 220.127.116.11/24 to application servers (like www etc) should go T1 first
if T1 is unavailable, traffic from 18.104.22.168/24 will go to VPN between FW1 and FW2, however, 22.214.171.124/24 must be translated to 126.96.36.199/24 and application servers' IP must be changed as well. (so VPN interesting traffic is from 188.8.131.52/24 to 184.108.40.206/24)
e.g, while using T1 link, one application server, server1(IP is 220.127.116.11), server2(18.104.22.168) while using VPN link, application server still is server1, but IP is 22.214.171.124, server 2 will be 126.96.36.199 etc
I am looking for an automatic failover solution.
also, we don't have any DNS server internally, so using hosts file now, your suggestion for any DNS solution is appreciated as well